GDB：打破IF可变同等价值 [英] GDB: break if variable equal value

问题描述

我喜欢让GDB设置断点，当变量等于某个值我设置，我想这个例子：

I like to make GDB set a break point when a variable equal some value I set, I tried this example:

#include <stdio.h>
main()
{ 
     int i = 0;
     for(i=0;i<7;++i)
        printf("%d\n", i);

     return 0;
}

从GDB输出：

(gdb) break if ((int)i == 5)
No default breakpoint address now.
(gdb) run
Starting program: /home/SIFE/run 
0
1
2
3
4
5
6

Program exited normally.
(gdb)

就像你看到的，GDB没有做任何破发点，这可能与GDB？

Like you see, GDB didn't make any break point, is this possible with GDB?

推荐答案

除了观察点嵌套在一个断点内
您还可以设置一个断点在文件名：LINE_NUMBER和使用条件。
我发现它有时会更容易。

in addition to a watchpoint nested inside a breakpoint you can also set a single breakpoint on the 'filename:line_number' and use a condition. I find it sometimes easier.

(gdb) break iter.c:6 if i == 5
Breakpoint 2 at 0x4004dc: file iter.c, line 6.
(gdb) c
Continuing.
0
1
2
3
4

Breakpoint 2, main () at iter.c:6
6           printf("%d\n", i);

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